CN203396891U - Transformer wire fracture detection device - Google Patents
Transformer wire fracture detection device Download PDFInfo
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- CN203396891U CN203396891U CN201320384211.0U CN201320384211U CN203396891U CN 203396891 U CN203396891 U CN 203396891U CN 201320384211 U CN201320384211 U CN 201320384211U CN 203396891 U CN203396891 U CN 203396891U
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Abstract
The utility model discloses a transformer wire fracture detection device. The transformer wire fracture detection device is connected in parallel with a transformer. The transformer wire fracture detection device includes an input circuit, a first-stage amplification circuit, a second-stage amplification circuit and an output circuit; the input circuit receives input signals provided by a main control chip, wherein the input signals are provided to the transformer; the first-stage amplification circuit is connected with the input circuit; the second-stage amplification circuit is connected with the first-stage amplification circuit; the input signals are outputted to the first-stage amplification circuit through the input circuit; after being amplified by the first-stage amplification circuit, the input signals are outputted to the second-stage amplification circuit; after being further amplified by the second-stage amplification circuit, the input signals are outputted to the output circuit; after filtering the output of the second-stage amplification circuit, the output circuit outputs output signals to the main control chip; and the main control chip judges whether wire fracture occurs on the transformer based on the output signals. The transformer wire fracture detection device can conveniently and accurately detect whether the connection of the transformer is normal or not in a real-time manner with the state of the operation of a controller being not affected.
Description
Technical field
The utility model relates to low voltage electrical apparatus technology field, more particularly, relates to a kind of transformer disconnection pick-up unit.
Background technology
Mutual inductor is a basic element of character of device for switching.Mutual inductor need to use wire to be connected with the controller of gauge tap action, the in the situation that of use for a long time in industrial occasions, be difficult to guarantee that this connects always excellent, once there is broken string or loose contact, mutual inductor can not be effectively in running order, the normal dropout of isolating switch or fault overcurrent are threaded off, will bring huge potential safety hazard, and testing must be carried out under the state that does not affect equipment work, thereby must detect mutual inductor and whether break, as broken string just provides warning message immediately, be convenient to fix a breakdown in time, guarantee the reliability of mutual inductor long-term work.
Determination methods of the prior art normally adopts the circuit of differential amplification or adopts fixed voltage to be added on mutual inductor always, the decision circuitry more complicated of use.Also some prior aries is used fixed voltage to detect, or used the judgement of two-way power supply, optocoupler detection etc., its defect be can not control judgement and complex structure, cost is higher.
Utility model content
The utility model is intended to propose a kind of can power failure, does not affect the pick-up unit that whether exists disconnection fault to judge to mutual inductor in the situation of controller normal operation.
According to an embodiment of the present utility model, a kind of transformer disconnection pick-up unit is proposed, in parallel with mutual inductor, this transformer disconnection pick-up unit comprises input circuit, first order amplifying circuit, second level amplifying circuit and output circuit, the input signal being provided by main control chip is provided input circuit, and this input signal also offers mutual inductor.First order amplifying circuit is connected to input circuit, second level amplifying circuit is connected to first order amplifying circuit, input signal outputs to first order amplifying circuit through input circuit, first order amplifying circuit is exported to after the amplifying circuit ，You second level, second level amplifying circuit amplifies again and is exported to output circuit after amplifying.After output circuit carries out filtering to the output of second level amplifying circuit, output signal output is to main control chip, and main control chip judges based on output signal whether mutual inductor breaks.
In one embodiment, input circuit comprises the first resistance, the second resistance, the 11 resistance and diode.The first end of the 11 resistance receives input signal, the second end of the 11 resistance is connected to the positive pole of diode, the negative pole of diode is connected to the first end of mutual inductor and the first end of the first resistance, the second end of the first resistance is connected to the first end of the second resistance, the second end ground connection of the second end of the second resistance and mutual inductor, the second end of the first resistance and the second resistance) the first end output that is input circuit.
In one embodiment, the output of input circuit is connected to first order amplifying circuit by the 3rd resistance, and first order amplifying circuit comprises the first operational amplifier, the 4th resistance, the 5th resistance.The 3rd resistance is connected to the negative input pin of the first operational amplifier, the 5th resistance is connected between the positive input pin and ground of the first operational amplifier, the 4th resistance is connected between the negative input pin and output pin of the first operational amplifier, connect+5V of the positive bias pin voltage of the first operational amplifier, connect-5V of the negative bias pin voltage of the first operational amplifier, the output pin of the first operational amplifier is the output of first order amplifying circuit.
In one embodiment, the output of first order amplifying circuit is connected to second level amplifying circuit by the 6th resistance, and second level amplifying circuit comprises the second operational amplifier, the 7th resistance, the 8th resistance, the 9th resistance.The 6th resistance is connected to the negative input pin of the second operational amplifier and the first end of the 7th resistance, the second end of the 7th resistance is connected to reference voltage, the 9th resistance is connected between the positive input pin and ground of the second operational amplifier, the 8th resistance is connected between the negative input pin and output pin of the second operational amplifier, and the output pin of the second operational amplifier is the output of second level amplifying circuit.
In one embodiment, output circuit comprises electric capacity and the tenth resistance.The first end of electric capacity is connected to the output of second level amplifying circuit and the first end of the tenth resistance, the second end output signal output of the tenth resistance.
Transformer disconnection pick-up unit of the present utility model can not affect under the state of controller work; whether in real time, detect accurately, easily mutual inductor connects normal; and needn't allow user stop power supply; method by loaded down with trivial details dismounting frame circuit breaker body and controller thereof checks mutual inductor break-make again; realize the detection to mutual inductor work, guarantee the reliability of mutual inductor long-term work.
Accompanying drawing explanation
It is more obvious that the above and other feature of the utility model, character and advantage become the description by below in conjunction with drawings and Examples, and identical Reference numeral represents identical feature all the time in the accompanying drawings, wherein:
Fig. 1 has disclosed according to the circuit structure diagram of the transformer disconnection pick-up unit of an embodiment of the present utility model.
Embodiment
Main design thought of the present utility model is first to detect current transformer signal, then signal is obtained after average treatment to the reference voltage of a balance.When the judgement of needs broken string, microprocessor provides a decision level by related circuit, if current transformer circuit supervision fail, this reference voltage can be undergone mutation, and therefore detecting this reference voltage just can draw the conclusion whether breaking.
Implementation of the present utility model is as follows, and shown in figure 1, Fig. 1 has disclosed according to the circuit structure diagram of the transformer disconnection pick-up unit of an embodiment of the present utility model.This transformer disconnection pick-up unit, L is in parallel with mutual inductor.This transformer disconnection pick-up unit comprises input circuit, first order amplifying circuit, second level amplifying circuit and output circuit.
The input signal INPUT being provided by main control chip is provided input circuit, and this input signal INPUT also offers mutual inductor L.With reference to the embodiment shown in figure 1, input circuit comprises the first resistance R 1, the second resistance R the 2, the 11 resistance R 11 and diode D1.The first end of the 11 resistance R 11 receives input signal INPUT, the second end of the 11 resistance R 11 is connected to the positive pole of diode D1, the negative pole of diode D1 is connected to the first end of mutual inductor L and the first end of the first resistance R 1, the second end of the first resistance R 1 is connected to the first end of the second resistance R 2, the second end ground connection of the second end of the second resistance R 2 and mutual inductor L, the output that the second end of the first resistance R 1 and the first end of the second resistance R 1 are input circuit.
First order amplifying circuit is connected to input circuit, second level amplifying circuit is connected to first order amplifying circuit, input signal INPUT outputs to first order amplifying circuit through input circuit, first order amplifying circuit is exported to after the amplifying circuit ，You second level, second level amplifying circuit amplifies again and is exported to output circuit after amplifying.Shown in figure 1, the output of input circuit is connected to first order amplifying circuit by the 3rd resistance R 3, and first order amplifying circuit comprises the first operational amplifier U1, the 4th resistance R 4, the 5th resistance R 5.The 3rd resistance R 3 is connected to the negative input pin 6 of the first operational amplifier U1, the 5th resistance R 5 is connected between the positive input pin 5 and ground of the first operational amplifier U1, the 4th resistance R 4 is connected between the negative input pin 6 and output pin 7 of the first operational amplifier U1, connect+5V of positive bias pin 4 voltage of the first operational amplifier U1, connect-5V of negative bias pin 7 voltage of the first operational amplifier U1, the output pin 7 of the first operational amplifier U1 is the output of first order amplifying circuit.Continuation is with reference to shown in figure 1, and the output of first order amplifying circuit is connected to second level amplifying circuit by the 6th resistance R 6, and second level amplifying circuit comprises the second operational amplifier U2, the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9.The 6th resistance R 6 is connected to the negative input pin 9 of the second operational amplifier U2 and the first end of the 7th resistance R 7, the second end of the 7th resistance R 7 is connected to reference voltage V 0, the 9th resistance R 9 is connected between the positive input pin one 0 and ground of the second operational amplifier U2, the 8th resistance R 8 is connected between the negative input pin 9 and output pin 8 of the second operational amplifier U2, and the output pin 8 of the second operational amplifier U2 is the output of second level amplifying circuit.
After output circuit carries out filtering to the output of second level amplifying circuit, output signal output OUTPUT is to main control chip, and main control chip judges based on output signal OUTPUT whether mutual inductor breaks.Shown in figure 1, output circuit comprises capacitor C 1 and the tenth resistance R 10.The first end of capacitor C 1 is connected to the output of second level amplifying circuit U2 and the first end of the tenth resistance R 10, the second end output signal output OUTPUT of the tenth resistance R 10.
Transformer disconnection pick-up unit of the present utility model adopts hardware benchmark as signal zero-bit on the one hand.When mutual inductor and controller respective terminal connects and while there is broken string, because mutual inductor coil resistance is generally several ohm to hundreds of ohm, load input signal INPUT and form loop through mutual inductor coil ground connection GND, do not have signal to add to operational amplifier.The corresponding numerical value change of hardware benchmark as zero-bit when effective value corresponding to output signal OUTPUT that main control chip (microprocessor) is got more do not load input signal INPUT is little; When if mutual inductor does not disconnect online or, the input signal INPUT loading does not form loop, main control chip microprocessor loads input signal INPUT and is all added on operational amplifier, so the corresponding effective value of output signal OUTPUT got of main control chip (microprocessor) is larger as the corresponding numerical value change of hardware benchmark of zero-bit while more not adding input signal INPUT.
Transformer disconnection pick-up unit of the present utility model adopts cycle mean value as zero-bit on the other hand.When mutual inductor and controller respective terminal connects and while there is broken string, because mutual inductor coil resistance is generally several ohm to hundreds of ohm, load input signal INPUT and form loop through mutual inductor coil ground connection GND, do not have signal to add to operational amplifier.When the zero-bit respective value that the instantaneous mean value of the output signal OUTPUT that main control chip (microprocessor) is got obtains does not more load input signal INPUT, the zero-bit respective value of signal does not change little.When if mutual inductor does not disconnect online or, load input signal INPUT and do not form loop, main control chip (microprocessor) loads input signal INPUT and is all added on operational amplifier, and when the zero-bit respective value that the instantaneous mean value of the output signal OUTPUT of sampling this week obtains does not more load input signal INPUT, the zero-bit respective value of signal does not change greatly.
The effect of capacitor C 1 is the burr of filtering output signal OUTPUT, makes judgement more accurate.
Conventionally judge whether mutual inductor breaks and have two kinds of modes, input is stable and reliable when guaranteeing broken string, and sense cycle is definite according to needing in real time, and the time of generally getting a plurality of cycles is a cycle.
The course of work and the principle of work of transformer disconnection pick-up unit of the present utility model when adopting hardware benchmark as signal zero-bit is as follows:
Main control chip is in collection signal, and the corresponding numerical value of acquisition hardware benchmark is as zero-bit, and the corresponding numerical value of this hardware benchmark is all generally more stable or changes very littlely, and the size by comparison signal respective value and zero-bit respective value judges transformer disconnection situation.When detecting mutual inductor, main control chip loads input signal INPUT, when without broken string, input signal INPUT by mutual inductor coil to (being equivalent to short circuit), wait to stablize several all after dates, the corresponding numerical value change of hardware benchmark as zero-bit when the effective value that output signal OUTPUT is corresponding does not more load input signal INPUT is little.When having broken string, it is upper that input signal INPUT is added in output signal OUTPUT by operational amplifier, waits to stablize several all after dates, and the corresponding numerical value change of hardware benchmark as zero-bit when its corresponding effective value does not more load input signal INPUT is larger.
The course of work and the principle of work of transformer disconnection pick-up unit of the present utility model when adopting cycle mean value as zero-bit is as follows:
A main control chip collection signal, the respective value of signal zero-bit adopts the instantaneous mean value calculation of this signal cycle to obtain, and computing formula is as follows:
Generally can think that the respective value of signal zero-bit changes not quite, judges transformer disconnection situation by following the tracks of the variation of this zero-bit respective value.When detecting mutual inductor, main control chip loads input signal INPUT, when without broken string, input signal INPUT by mutual inductor coil to (being equivalent to short circuit), wait to stablize several all after dates, when the zero-bit respective value that the instantaneous mean value of the output signal OUTPUT in this cycle obtains does not more add input signal INPUT, the zero-bit respective value of signal does not change little.When having broken string, input signal INPUT is added on the output signal OUTPUT of sampling by operational amplifier, wait to stablize several all after dates, when the zero-bit respective value that the instantaneous mean value of the output signal OUTPUT of this week obtains does not more load input signal INPUT, the zero-bit respective value of signal does not change greatly.
Transformer disconnection pick-up unit of the present utility model can not affect under the state of controller work; whether in real time, detect accurately, easily mutual inductor connects normal; and needn't allow user stop power supply; method by loaded down with trivial details dismounting frame circuit breaker body and controller thereof checks mutual inductor break-make again; realize the detection to mutual inductor work, guarantee the reliability of mutual inductor long-term work.
Above-described embodiment is to provide to being familiar with person in the art and realizes or use of the present utility model; those skilled in the art can be in the situation that not departing from utility model thought of the present utility model; above-described embodiment is made to various modifications or variation; thereby protection domain of the present utility model do not limit by above-described embodiment, and it should be the maximum magnitude that meets the inventive features that claims mention.
Claims (5)
1. a transformer disconnection pick-up unit, is characterized in that, in parallel with mutual inductor, and this transformer disconnection pick-up unit comprises input circuit, first order amplifying circuit, second level amplifying circuit and output circuit,
The input signal (INPUT) being provided by main control chip is provided input circuit, and this input signal (INPUT) also offers mutual inductor;
First order amplifying circuit is connected to input circuit, second level amplifying circuit is connected to first order amplifying circuit, input signal (INPUT) outputs to first order amplifying circuit through input circuit, first order amplifying circuit is exported to after the amplifying circuit ，You second level, second level amplifying circuit amplifies again and is exported to output circuit after amplifying;
After output circuit carries out filtering to the output of second level amplifying circuit, output signal output (OUTPUT) is to main control chip, and main control chip judges based on output signal (OUTPUT) whether mutual inductor breaks.
2. transformer disconnection pick-up unit as claimed in claim 1, is characterized in that, described input circuit comprises the first resistance (R1), the second resistance (R2), the 11 resistance (R11) and diode (D1);
The first end of the 11 resistance (R11) receives input signal (INPUT), the second end of the 11 resistance (R11) is connected to the positive pole of diode (D1), the negative pole of diode (D1) is connected to the first end of mutual inductor (L) and the first end of the first resistance (R1), the second end of the first resistance (R1) is connected to the first end of the second resistance (R2), the second end ground connection of the second end of the second resistance (R2) and mutual inductor (L), the output that the first end of the second end of the first resistance (R1) and the second resistance (R1) is input circuit.
3. transformer disconnection pick-up unit as claimed in claim 2, it is characterized in that, the output of described input circuit is connected to first order amplifying circuit by the 3rd resistance (R3), and first order amplifying circuit comprises the first operational amplifier (U1), the 4th resistance (R4), the 5th resistance (R5);
The 3rd resistance (R3) is connected to the negative input pin (6) of the first operational amplifier (U1), the 5th resistance (R5) is connected between the positive input pin (5) and ground of the first operational amplifier (U1), the 4th resistance (R4) is connected between the negative input pin (6) and output pin (7) of the first operational amplifier (U1), connect+5V of positive bias pin (4) voltage of the first operational amplifier (U1), connect-5V of negative bias pin (7) voltage of the first operational amplifier (U1), the output pin (7) of the first operational amplifier (U1) is the output of first order amplifying circuit.
4. transformer disconnection pick-up unit as claimed in claim 3, it is characterized in that, the output of described first order amplifying circuit is connected to second level amplifying circuit by the 6th resistance (R6), and second level amplifying circuit comprises the second operational amplifier (U2), the 7th resistance (R7), the 8th resistance (R8), the 9th resistance (R9);
The 6th resistance (R6) is connected to the negative input pin (9) of the second operational amplifier (U2) and the first end of the 7th resistance (R7), the second end of the 7th resistance (R7) is connected to reference voltage (V0), the 9th resistance (R9) is connected between the positive input pin (10) and ground of the second operational amplifier (U2), the 8th resistance (R8) is connected between the negative input pin (9) and output pin (8) of the second operational amplifier (U2), and the output pin (8) of the second operational amplifier (U2) is the output of second level amplifying circuit.
5. transformer disconnection pick-up unit as claimed in claim 3, is characterized in that, described output circuit comprises electric capacity (C1) and the tenth resistance (R10);
The first end of electric capacity (C1) is connected to the output of second level amplifying circuit (U2) and the first end of the tenth resistance (R10), the second end output signal output (OUTPUT) of the tenth resistance (R10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320384211.0U CN203396891U (en) | 2013-06-28 | 2013-06-28 | Transformer wire fracture detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320384211.0U CN203396891U (en) | 2013-06-28 | 2013-06-28 | Transformer wire fracture detection device |
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| Publication Number | Publication Date |
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| CN203396891U true CN203396891U (en) | 2014-01-15 |
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| CN201320384211.0U Expired - Lifetime CN203396891U (en) | 2013-06-28 | 2013-06-28 | Transformer wire fracture detection device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105277834A (en) * | 2014-06-18 | 2016-01-27 | 艾默生网络能源有限公司 | Detection circuit |
| CN105445537A (en) * | 2015-12-29 | 2016-03-30 | 威特龙消防安全集团股份公司 | Instrument transformer detection device and method |
| CN106771838A (en) * | 2016-12-29 | 2017-05-31 | 许继集团有限公司 | Transformer CT broken strings method of discrimination, device and differential protecting method, device |
-
2013
- 2013-06-28 CN CN201320384211.0U patent/CN203396891U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105277834A (en) * | 2014-06-18 | 2016-01-27 | 艾默生网络能源有限公司 | Detection circuit |
| CN105445537A (en) * | 2015-12-29 | 2016-03-30 | 威特龙消防安全集团股份公司 | Instrument transformer detection device and method |
| CN106771838A (en) * | 2016-12-29 | 2017-05-31 | 许继集团有限公司 | Transformer CT broken strings method of discrimination, device and differential protecting method, device |
| CN106771838B (en) * | 2016-12-29 | 2019-09-13 | 许继集团有限公司 | Transformer CT broken string method of discrimination, device and differential protecting method, device |
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| C14 | Grant of patent or utility model | ||
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Granted publication date: 20140115 |
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| CX01 | Expiry of patent term |